Belt for transmitting power.



C. P. GRAY.

BELT FOR TRANSMITTING POWER.

APPLIGATION FILED JUNEE, 1907.

929,760. Patented Aug: 3, 1909.

WITNESSES: INVENTOR- ATTORNEY.

UNITED STATES PATENT OFFICE.

CHARLES F. GRAY, OF SIERRA MADRE, CALIFORNIA, ASSIGNOR TO THE SINGERMANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

BELT FOR TRANSMITTING POWER.

To all whom it may concern:

Be it known that I, CIIARLEs F. GRAY, a citizen of the United States,and a resident of Sierra Madre, in the county of Los Angeles and Stateof California, have invented certain new and useful Improvements inBelts for llransmitting Power, of which the following is aspecification.

This invention. relates to improvements in belt connections for sewingmachines wherein the rotary movements of the needle-actuating andloop-taker actuating shafts must be constant and. of uniform regularity,as in maintaining the operative relationship between the needle andloop-taker at the time that the needle presents the loop of needlethread to the action of the loop -seizing point of the loop-taker.

The belt herein illustrated and described is intended. as an improvementupon the belt illustrated and described in United. States Patent No.667,830, issued February 12, 1901, to A. Steward.

In attempting to apply belts of the construction pointed out in theabove referred to patent, to sewing machines employed for, what istermed, cycle sewing, such machines as are commonly employed forbuttonholing, button sewing, eyeleting, tacking, barring, etc. andoperated in connection with a stop-motion device for automaticallyarresting the action of the stitch-forming and cloth-feeding mechanismsat the completion of a cycle of overseaming, it has been found that thesudden stopping of the machine would, in some instances, cause theclamps to be moved slightly out of adjustment with the coacting groovesformed in the belt pullcys. To overcome this difficulty I have providedthe belt with equidistantly arranged clamps provided with corrugationsinto which portions of the fibrous material of the belt are forced bythe act of securing the clamps upon the main portion of the belt.

v In the accompanying drawings illustrating the invention, in theseveral figures of which like parts are similarly designated, Figure 1is a View of a section of a belt driving pulley and a portion of a beltequipped with interiorly corrugated clamps, the latter shown in crosssection. Fig. 2 is a view in perspective of a section of belt equippedwith the construction of clamp shown in Fig. 1 and Fig. 3 is an enlargedview in perspective of the clamps shown in Figs. 1 and 2.

Specification of Letters Patent.

Application filed June 5, 1907.

Patented Aug. 3, 1909.

Serial No. 377,297.

8 represents a portion of the belt and 14. a construction of clampwherein the belt contacting surfaces are provided with corrugations 15and 16, into which the iibrous material of the belt is forced inattaching the clamp to the belt.

I11 the operation of the bolt, the walls 17 of the grooves formed in thepulley, tend to force the clamps out of adjustment in the direction ofthe travel of the belt, and the op positely arranged walls of saidgrooves tend to force the clamps in an opposite direction, and thiscontinued action of the walls of the grooves upon. clamps formed withoutcorrugations tends to iron down the fibrous material of the belt andcause the clamps to loose their hold upon the material, thus producingincreased liability of the belt to become weakened by the wear incidentto the oppositely directed movements of the clamps upon the belt, andthe liability of the clamps to mount the peripheral surface of thepulley instead of entering the grooves formed in said pulley. I

By the employment of clamps provided with corrugations into whichportions of fibrous material of the belt are forced by the act ofsecuring the clamps, increased resistance is effected without increasingthe weight of frictional. contact of the clamps at any one point, thusincreasing the utility of the belt to an extent that adapts it for usein connection with machines equipped with stop-mm tion devices andemployed for cycle sewing, without impairing it for use in connectionwith more delicately constructed and lighter running machines, such asare termed high speed and employed. mainly in connection with thestitching of cotton or linen productions, such as shirts, collars,cuffs, muslin underwear, etc.

What I claim is A belt connection for sewing machines comprising fibrousmaterial provided with equidistantly arranged interiorly corrugatedclamps into which portions of said material are forced by the act ofsecuring said clamps.

Signed at Sierra Madre, in the county of Los Angeles and State ofCalifornia, this 28th day of May, A. D. 1907.

. CHARLES F. CRAY. Witnesses:

JOHN C. Pnennn,

N. H. HosMEn.

